Suppose you use a DTD, and you declare a particular element, and the instance includes a child node of that element comprising only whitespace that does not match a PCDATA declaration.
假设使用 DTD 并且声明了某个元素，实例中该元素的一个子节点仅由与 PCDATA 声明不匹配的空白组成。
Finally, the last "p" is promotion. Because of its visibility, this element is often mistakenly thought of as comprising the whole of social marketing.
最后一个“ P ”是推广，由于推广的可见性，它常被误解成全部社会营销的构成。
You will find that waveforms (and many other things) are often stored in arrays, with each point in the waveform comprising an element of the array.
你会发现，波形数据(和其他很多数据)经常被保存在数组中，波形中的每个点对应数组中的一个元素。
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